Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F35/00—Cleaning arrangements or devices
  • B41F35/06—Cleaning arrangements or devices for offset cylinders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
  • B41P2235/00—Cleaning
  • B41P2235/10—Cleaning characterised by the methods or devices
  • B41P2235/20—Wiping devices
  • B41P2235/24—Wiping devices using rolls of cleaning cloth
  • B41P2235/246—Pressing the cleaning cloth against the cylinder

Definitions

• the present invention relates to a blanket washer for the cleaning of cylinders in a printing press, the blanket washer comprising a cleaning unit containing rolls for a cleaning cloth, which is to be transferred past an external pad unit on the cleaning unit.
• a blanket washer of the kind referred to above is for example shown and described in EP-B-0 613 421.
• This blanket washer has a pad unit integrally provided at its front end, and the whole blanket washer may be transferred along its central longitudinal axis for bringing its cleaning cloth, transferred over the pad unit, into and out of cleaning engagement with a cylinder, for example a blanket cylinder, in a printing press.
• a blanket washer of this kind does not have the desired flexibility for many uses.
• the space available for a blanket washer may be very limited, and it may for example be difficult to use a blanket washer with a fixed, central pad unit.
• a blanket washer of the kind referred to with a greatly improved flexibility may according to the invention be attained in that means are provided for mounting one or more pad units in different positions on the cleaning unit.
• the cleaning unit has a front profile for the mounting of one or more pad units in different positions .
• a pad unit may be mounted obliquely in relation to the central longitudinal axis of the cleaning unit, if the available space is too limited for a centrally mounted pad unit.
• two or even three cylinders may be cleaned by one blanket washer, provided with two or three pad units, respectively.
• the front profile of the cleaning unit is preferably curved, and each pad unit has a corresponding curvature at its back side for abutment against the front profile.
• Firm positions for the pad units may hereby be attained in that the front profile and the back side of the pad units have corresponding longitudinal serrations .
• the pad units may be attached to the front profile by means of for example screwing, adhesion, welding or snap- fastening, preferably by means of self-threading screws.
• Fig 1A is a side view of a blanket washer according to the invention and Fig IB is a top view of an end piece therefore,
• Figs 2A-C are side views of profiles for use in a blanket washer according to the invention.
• Fig 3 is a side view corresponding to Fig 1 of an alternative use of a blanket washer according to the invention,
• Fig 4 is a very schematic illustration of a printing unit in a printing press
• Figs 5A-D illustrate different practical uses of a blanket washer according to the invention.
• a blanket washer according to the invention comprises basically two end pieces 1 shown in Fig IB (but also in Figs 1A and 3) .
• the end pieces 1 may be manufactured of aluminium, but other materials can also be used.
• a number of longitudinal members to be described are arranged between the end pieces 1 so as together to form the blanket washer .
• the most important of these longitudinal members is a front profile 2.
• the end pieces 1 are attached, preferably by screws in screw fittings 2' and 3', to the profiles 2 and 3 so as to form a clening unit in the form of a longitudinal box or cassette to be arranged in a way not further illustrated or described in a printing press in the vicinity of a cylinder to be cleaned.
• the front and back profiles 2 and 3 have a length roughly corresponding to the length of a cylinder to be cleaned, which in practice may mean a length of for example 1.8 m.
• the profiles are preferably made of aluminium, but other materials may also be used.
• the purpose of the back profile 3 is mainly to stabilize the cleaning unit, and if a satisfactory stability is attained without it, it may be dispensed with. An advantage is hereby that admittance to the interior of the cleaning unit is simplified.
• Two shafts 4 and 5 are further journalled for rotation in the end pieces 1 for forming a reeling-off roll 4 and a reeling-on roll 5 with a cleaning cloth 6 (Fig 5) .
• either or both of the shafts are imparted a rotation for transferring the cleaning cloth 6 from the reeling-off roll 4 to the reeling-on roll 5.
• Means for imparting rotation to the shafts may preferably be arranged external of the cleaning unit for making it as simple as possible.
• the front profile 2 has a longitudinal serration or the like.
• a pad profile 7 has at its back side a corresponding serration and the same curvature as the front profile 2, so that when brought into engagement with the front profile 2, the pad profile 7 will attain a well defined position.
• the pad profile 7 has a length corresponding to that of the other profiles 2 and 3 and thus of the cylinder to be cleaned. It may be made of aluminium or any other suitable material .
• the pad profile 7 has holding means for a pad 8, so that a pad unit 7, 8 is formed.
• the pad 8 itself does not form any part of the present invention and may be of different materials and shapes depending on the intended cleaning purpose. Normally, it is made of a compressible material. If desired, it may be provided with means for transferring cleaning liquid to the cleaning cloth 6 passing over it. This may for example be accomplished by a longitudinal conduit, which extends through the pad, has holes extending to the front pad surface, and is connected to a source for cleaning liquid.
• the pad profile 7 is attached in a suitable way, such as by adhesion, welding or snap-fastening, but preferably by screwing. Holes may be drilled through the pad profile 7 and into the front profile 2 and self-threading screws be used for fastening the two parts together. After this fastening, the pad 8 may be put in proper position.
• the front profile 2 may preferably, as is depicted, extend 180° around the reeling-off roll 4. At its lower side it may as shown be somewhat extended for providing added stability to the cleaning unit, of which it is a part. Enough space must be left between the front profile 2 and the back profile 3 for allowing removal of a full reeling-on roll 5 after using up the cleaning cloth 6 and insertion of a new reeling-off roll 4 with a non-used cleaning cloth 6 thereafter.
• An example of a printing unit for printing with four colours on a paper web 10 is schematically shown in Fig 4. The paper web 10 is laid around an impression cylinder 11. In contact therewith are four blanket cylinders 12 for the four colours, and in contact with these blanket cylinders 12 are four plate cylinders 13.
• blanket washers are used for cleaning blanket cylinders, but they may equally well be used also for cleaning for example impression cylinders and plate cylinders. As is illustrated by dashed arrows in Fig 4, it may be desired to clean two blanket cylinders 12 and possibly also the impression cylinder 11.
• the front profile 2 may be provided with one or more pad units 7, 8 at different locations .
• a pad unit 7, 8 is centrally arranged on the front profile 2 (along the central longitudinal axis of the cleaning unit) and is to cleaningly apply its cloth 6 on the surface of a cylinder 14.
• the pad unit 7, 8 is upwardly and downwardly offset, respectively, for cleaning the cylinder 14 arranged above and below the cleaning unit, respectively.
• the front profile 2 is provided with two pad units 7, 8 for cleaning co-operation with two cylinders 14. Provided that certain geometrical conditions were met, three pad units could be arranged on one front profile for cleaning three cylinders at the same time.

Landscapes

• Inking, Control Or Cleaning Of Printing Machines (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

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ID=20415567

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Citations (7)

Family Cites Families (5)

• 1999
  • 1999-05-12 SE SE9901729A patent/SE9901729L/ not_active Application Discontinuation
• 2000
  • 2000-05-03 DE DE60002320T patent/DE60002320T2/de not_active Expired - Lifetime
  • 2000-05-03 EP EP00930007A patent/EP1187721B1/en not_active Expired - Lifetime
  • 2000-05-03 WO PCT/SE2000/000843 patent/WO2000069634A1/en active IP Right Grant
  • 2000-05-03 JP JP2000618078A patent/JP4610090B2/ja not_active Expired - Fee Related
• 2001
  • 2001-11-13 US US10/054,508 patent/US6557471B2/en not_active Expired - Fee Related

Patent Citations (7)

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